Thinking realistically it could be done quite cheaply as time is usually taken in the morgue waiting for the coroners report, embalming, registrar etc.
There would be a certain amount of time being held in the morgue waiting for the Coroner to do his job but that isn't always necessary if the deceased passed in hospital, Doctors report, Registrar then down the hole they go, just a few days.
As was said cardboard box, carry yourself then away you go, job done or have I missed something.
My wife having passed recently, cost because she passed at home and had to have an autopsy so she was held in the morgue until that could be done, then there was a long wait for a certain number of bodies to make the Crematorium viable for stoking up.
She was held for quite some time, in fact she was kept so long that when I asked to see her once more before the Crem opened up, was told she had deteriated so much it was not advisable, so the last sight of my dear wife was when she was still as pretty as before she passed.
Sorry to hear of your loss
Keep going
Lost my friend just before Christmas and a friends son just before that
2 funerals in a week
Not fun